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https://www.readbyqxmd.com/read/27925693/identification-of-n-arylated-nh125-analogues-as-rapid-eradicating-agents-against-mrsa-persister-cells-and-potent-biofilm-killers-of-gram-positive-pathogens
#1
Yasmeen Abouelhassan, Akash Basak, Hussain Yousaf, Robert William Huigens Iii
Bacterial biofilms housing dormant persister cells are innately tolerant to antibiotics and disinfectants, yet several membrane-active agents are known to eradicate tolerant bacterial cells. NH125, a membrane-active persister-killer and starting point for development, led to the identification of N-arylated analogues 1 and 2 and displayed improved biofilm-killing potencies and rapid persister-killing activities in stationary cultures of methicillin-resistant Staphylococcus aureus (MRSA). We found 1 and 2 to be superior to other membrane-active agents in biofilm eradication assays with 1 demonstrating minimum biofilm eradication concentrations (MBEC) of 23...
December 7, 2016: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/27925453/chest-computed-tomography-scores-in-patients-with-cystic-fibrosis-colonized-with-methicillin-resistant-staphylococcus-aureus-mrsa
#2
Michal Gur, Elena Spinelli, Glorida Tridello, Susanna Baltieri, Lucia Pinali, Stefania Montemezzi, Lea Bentur, Baroukh Maurice Assael
BACKGROUND: Methicillin-resistant Staphylococcus aureus (MRSA) is an important pathogen in Cystic Fibrosis (CF), with increasing incidence in recent years. We examined the association between bacterial colonization in the sputum (MRSA with or without pseudomonas (PA)) and computed tomography (CT) scores in CF patients. METHODS: MRSA patients were divided according to PA status based on at least three consecutive sputum cultures; controls were patients without MRSA (with or without PA), matched for gender and age at CT...
December 7, 2016: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/27925401/dickeya-dadantii-pectic-enzymes-necessary-for-virulence-are-also-responsible-for-activation-of-the-arabidopsis-thaliana-innate-immune-system
#3
Dominique Expert, Oriane Patrit, Vladimir E Shevchik, Claude Perino, Virginie Boucher, Creze Christophe, Estelle Wenes, Mathilde Fagard
Soft-rot diseases of plants attributed to Dickeya dadantii result from lysis of plant cell wall due to pectic enzymes released by the bacterial cell by a type II secretion system (T2SS). A. thaliana can express several lines of defence against this bacterium. We employed bacterial mutants with defective envelope structures or secreted proteins to examine early plant defence reactions. We focused on the production of AtrbohD-dependent ROS, callose deposition and cell death as indicators of these reactions. We observed a significant reduction in ROS and callose formation with a bacterial mutant where genes encoding five pectate lyases (Pels) were disrupted...
December 7, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27925336/non-exponential-growth-of-mycobacterium-leprae-thai-53-strain-cultured-in-vitro
#4
Kazunobu Amako, Ken-Ichiro Iida, Mitsumasa Saito, Yoshitosi Ogura, Tetsuya Hayashi, Shin-Ichi Yoshida
To determine why cultivation of Mycobacterium leprae in vitro has not been successful, we attempted to culture this bacterium in media supplemented with a variety of biological materials. We observed a slight increase in the number of cells in medium supplemented with human blood plasma and an extract of nude mouse tissue after more than 3 months of cultivation at 30°C. To ascertain whether this increase was real growth, we analyzed the growth by droplet digital PCR. The analysis had the following two results: the slow increase in the copy number of cell-associated DNA and the release of a large amount of DNA into the culture medium from bacterial cells during cultivation...
December 7, 2016: Microbiology and Immunology
https://www.readbyqxmd.com/read/27924936/genomic-duplication-and-translocation-of-reactivation-transactivator-and-bzip-homolog-genes-is-a-conserved-event-in-alcelaphine-herpesvirus-1
#5
Françoise Myster, Steven J van Beurden, Océane Sorel, Nicolás M Suárez, Alain Vanderplasschen, Andrew J Davison, Benjamin G Dewals
Alcelaphine herpesvirus 1 (AlHV-1) is a gammaherpesvirus carried asymptomatically by wildebeest. Upon cross-species transmission, AlHV-1 induces malignant catarrhal fever (MCF), a fatal lymphoproliferative disease of ruminants, including cattle. The strain C500 has been cloned as an infectious, pathogenic bacterial artificial chromosome (BAC) that is used to study MCF. Although AlHV-1 infection can be established in cell culture, multiple passages in vitro cause a loss of virulence associated with rearrangements of the viral genome...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924606/oral-epithelial-cell-culture-model-for-studying-the-pathogenesis-of-chronic-inflammatory-disease
#6
Mike R Milward, Martin R Ling, Melissa M Grant, Iain L C Chapple
The interactions between bacteria, epithelium, and neutrophilic polymorphonuclear leukocytes (neutrophils) are the key to the initiation and progression of many chronic inflammatory-immune diseases. In addition, all can be influenced by external factors, such as micronutrients, thereby providing potentially novel approaches to therapy. This chapter will therefore provide detailed methods for core techniques involved in studying cellular and molecular epithelial responses to a bacterial challenge in relation to chronic inflammatory disease pathogenesis and therapy...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27924591/the-oral-microbiota-in-health-and-disease-an-overview-of-molecular-findings
#7
José F Siqueira, Isabela N Rôças
Culture-independent nucleic acid technologies have been extensively applied to the analysis of oral bacterial communities associated with healthy and diseased conditions. These methods have confirmed and substantially expanded the findings from culture studies to reveal the oral microbial inhabitants and candidate pathogens associated with the major oral diseases. Over 1000 bacterial distinct species-level taxa have been identified in the oral cavity and studies using next-generation DNA sequencing approaches indicate that the breadth of bacterial diversity may be even much larger...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27921389/superiority-of-sds-lysis-over-saponin-lysis-for-direct-bacterial-identification-from-positive-blood-culture-bottle-by-maldi-tof-ms
#8
Yvan Caspar, Cécile Garnaud, Mariya Raykova, Sébastien Bailly, Marie Bidart, Danièle Maubon
PURPOSE: Fast species diagnosis has an important health care impact, as rapid and specific antibacterial therapy is of clear benefit for patient's outcome. Here we propose a new protocol for species identification directly from positive blood cultures. EXPERIMENTAL DESIGN: We compared four in-house protocols for bacterial identification by mass spectrometry directly from clinical positive blood cultures evaluating 2 lytic agents, SDS and saponin, and 2 protein extraction schemes, fast (FP) and long (LP)...
December 6, 2016: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/27917346/neonatal-bacterial-meningitis-in-tikur-anbessa-specialized-hospital-ethiopia-a-10-year-retrospective-review
#9
Melese Abate Reta, Tamrat Abebe Zeleke
BACKGROUND: Bacterial meningitis is still a major public health threat in developing countries. It is an overwhelming infection with a high morbidity and mortality rate, especially in neonates. The aim of this study was to determine the prevalence and etiological agents that cause bacterial neonatal meningitis at Tikur Anbessa Specialized Hospital (TASH). METHODS: This is a retrospective analysis of 1189 cerebrospinal fluid (CSF) specimens submitted to the bacteriology laboratory of TASH for culture from 2001 to 2010...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27917206/anticancer-and-antibacterial-secondary-metabolites-from-the-endophytic-fungus-penicillium-sp-cam64-against-multi-drug-resistant-gram-negative-bacteria
#10
Jean-Bosco Jouda, Jean-de-Dieu Tamokou, Céline Djama Mbazoa, Prodipta Sarkar, Prasanta Kumar Bag, Jean Wandji
BACKGROUND: The emergence of multiple-drug resistance bacteria has become a major threat and thus calls for an urgent need to search for new effective and safe anti-bacterial agents. OBJECTIVES: This study aims to evaluate the anticancer and antibacterial activities of secondary metabolites from Penicillium sp., an endophytic fungus associated with leaves of Garcinia nobilis. METHODS: The culture filtrate from the fermentation of Penicillium sp...
September 2016: African Health Sciences
https://www.readbyqxmd.com/read/27916901/modeling-lactic-fermentation-of-gow%C3%A3-using-lactobacillus-starter-culture
#11
Bettencourt de J C Munanga, Gérard Loiseau, Joël Grabulos, Christian Mestres
A global model of the lactic fermentation step of gowé was developed by assembling blocks hosting models for bacterial growth, lactic acid production, and the drop of pH during fermentation. Commercial strains of Lactobacillus brevis and of Lactobacillus plantarum were used; their growth was modeled using Rosso's primary model and the gamma concept as a secondary model. The optimum values of pH and temperature were 8.3 ± 0.3, 44.6 ± 1.2 °C and 8.3 ± 0.3, 3.2 ± 37.1 °C with μmax values of 1.8 ± 0.2 and 1...
December 1, 2016: Microorganisms
https://www.readbyqxmd.com/read/27916373/antibiotic-releasing-microspheres-prevent-mesh-infection-in%C3%A2-vivo
#12
Kevin T Grafmiller, Sean T Zuckerman, Clayton Petro, Lijia Liu, Horst A von Recum, Michael J Rosen, Julius N Korley
BACKGROUND: Infection remains a dreaded complication after implantation of surgical prosthetics, particularly after hernia repair with synthetic mesh. We previously demonstrated the ability of a newly developed polymer to provide controlled release of an antibiotic in a linear fashion over 45 d. We subsequently showed that coating mesh with the drug-releasing polymer prevented a Staphylococcus aureus (SA) infection in vivo. To broaden the applicability of this technology, the polymer was synthesized as isolated "microspheres" and loaded with vancomycin (VM) before conducting a noninferiority analysis...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27916290/time-to-positivity-of-blood-cultures-in-patients-with-bloodstream-infections-a-useful-prognostic-tool
#13
Guillermo Martín-Gutiérrez, Carlos Martín-Pérez, Antonio Gutiérrez-Pizarraya, José A Lepe, José M Cisneros, Javier Aznar
OBJECTIVE: The time to positivity (TTP) of blood cultures in patients with bloodstream infections (BSIs) has been considered to be a possible prognostic tool for some bacterial species. However, notable differences have been found between sampling designs and statistical methods in published studies to date, which makes it difficult to compare results or to derive reliable conclusions. Our objective was to evaluate the clinical and microbiological implications of TTP among patients with BSI caused by the most common pathogens...
December 1, 2016: Enfermedades Infecciosas y Microbiología Clínica
https://www.readbyqxmd.com/read/27915285/depth-dependent-influence-of-different-land-use-systems-on-bacterial-biogeography
#14
Brent J Seuradge, Maren Oelbermann, Josh D Neufeld
Despite progress in understanding microbial biogeography of surface soils, few studies have investigated depth-dependent distributions of terrestrial microorganisms in subsoils. We leveraged high-throughput sequencing of 16S rRNA genes obtained from soils collected from the RARE: Charitable Research Reserve (Cambridge, Ontario, Canada) to assess the influence of depth on bacterial communities across various land-use types. Although bacterial communities were strongly influenced by depth across all sites, the magnitude of this influence was variable and demonstrated that land-use attributes also played a significant role in shaping soil bacterial communities...
December 2, 2016: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27914450/mechanisms-of-inflammatory-injury-of-renal-tubular-cells-in-a-cellular-model-of-pyelonephritis
#15
M A Morosanova, E Y Plotnikov, L D Zorova, I B Pevzner, V A Popkov, D N Silachev, S S Jankauskas, V A Babenko, D B Zorov
Previously, we have assembled a cellular model of pyelonephritis which contains a primary culture of renal tubular epithelial cells, mononuclear leukocytes, and bacterial lysate or lipopolysaccharide. After cocultivation of renal cells with leukocytes and bacterial lysate, proinflammatory changes were observed in the renal cells, followed by nitrosative and oxidative stress and cell death. The interaction of bacterial antigens not only with leukocytes, but also with epithelial cells of the renal tubules, was partially mediated by signaling pathways involving Toll-like receptors (TLR2 and TLR4)...
November 2016: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/27914366/rapid-and-low-cost-biosensor-for-the-detection-of-staphylococcus-aureus
#16
Ghadeer A R Y Suaifan, Sahar Alhogail, Mohammed Zourob
Staphylococcus aureus (S. aureus) is one of the most common etiological agents in hospital-acquired infections and food-borne illness. S. aureus toxins and virulence proteases often circulate in host blood vessels leading to life-threatening diseases. Standard identification approaches include bacterial culturing method, which takes several days. Other nucleic acid-based methods were expensive and required trained personnel. To surmount these limitations, a paper-based biosensor was developed. The sensing mechanism was based on the proteolytic activity of S...
November 21, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27914268/anti-adhesive-antimicrobial-peptide-coating-prevents-catheter-associated-infection-in-a-mouse-urinary-infection-model
#17
Kai Yu, Joey C Y Lo, Mei Yan, Xiaoqiang Yang, Donald E Brooks, Robert E W Hancock, Dirk Lange, Jayachandran N Kizhakkedathu
Catheter-associated urinary tract infections (CAUTIs) represent one of the most common hospital acquired infections with significant economic consequences and increased patient morbidity. CAUTIs often start with pathogen adhesion and colonization on the catheter surface followed by biofilm formation. Current strategies to prevent CAUTIs are insufficiently effective and antimicrobial coatings based on antimicrobial peptides (AMPs) hold promise in curbing CAUTIs. Here we report an effective surface tethering strategy to prepare AMP coatings on polyurethane (PU), a common biomedical plastic used for catheter manufacture, by using an anti-adhesive hydrophilic polymer coating...
November 24, 2016: Biomaterials
https://www.readbyqxmd.com/read/27914106/effect-of-cranberry-extract-on-the-frequency-of-bacteriuria-in-dogs-with-acute-thoracolumbar-disk-herniation-a-randomized-controlled-clinical-trial
#18
N J Olby, S L Vaden, K Williams, E H Griffith, T Harris, C L Mariani, K R Muñana, P J Early, S R Platt, L Boozer, C Giovanella, R Longshore
BACKGROUND: Dogs with spinal cord injury are at increased risk of developing bacteriuria due to increased residual urine volume. Cranberry extract inhibits binding of E. coli to uroepithelial cells, potentially reducing risk of bacteriuria. HYPOTHESIS: Cranberry extract reduces risk of bacteriuria in dogs after acute TL-IVDH. ANIMALS: Client-owned dogs with acute onset TL-IVDH causing nonambulatory status. METHODS: Randomized, placebo-controlled, blinded, prospective clinical trial...
December 3, 2016: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/27913725/in-vivo-expression-technology-and-5-end-mapping-of-the-borrelia-burgdorferi-transcriptome-identify-novel-rnas-expressed-during-mammalian-infection
#19
Philip P Adams, Carlos Flores Avile, Niko Popitsch, Ivana Bilusic, Renée Schroeder, Meghan Lybecker, Mollie W Jewett
Borrelia burgdorferi, the bacterial pathogen responsible for Lyme disease, modulates its gene expression profile in response to the environments encountered throughout its tick-mammal infectious cycle. To begin to characterize the B. burgdorferi transcriptome during murine infection, we previously employed an in vivo expression technology-based approach (BbIVET). This identified 233 putative promoters, many of which mapped to un-annotated regions of the complex, segmented genome. Herein, we globally identify the 5' end transcriptome of B...
December 1, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27913419/benzene-degradation-by-variovorax-sp-within-a-coal-tar-contaminated-groundwater-microbial-community
#20
Kevin M Posman, Christopher M DeRito, Eugene L Madsen
: Investigations of environmental microbial communities are crucial for the discovery of populations capable of degrading hazardous compounds and may lead to improved bioremediation strategies. The goal of this study was to identify microorganisms responsible for aerobic benzene degradation in coal-tar contaminated groundwater. Benzene degradation was monitored in laboratory incubations of well waters using gas chromatography mass spectrometry (GC/MS). Stable isotope probing (SIP) experiments using (13)C-benzene allowed us to obtain (13)C-labled community DNA; from this, 16S rRNA clone libraries identified γ- and β-Proteobacteria as the active benzene metabolizing microbial populations...
December 2, 2016: Applied and Environmental Microbiology
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